Rotary calendar



s. NAKAHARA ROTARY CALENDAR Dec. 8, 1931.

Filed Dec. 51, 1930 Patented Dec. 8, 1931 NT '0F-FICE,

SADAYOSHI NAKAHARA, OF NEW YORK, N. Y. i

, ROTARY cnnnnnnit AppncatidnA med December 31, 1930. seriiNoQsoaese.

This improvement relates more particularly to desk calendars mounted on asupporting base and having a casing, provided with sight openings adapted to show the day of the week and the day of the month, which are adapted to be changed daily by simply turninga knurled head at one end of the casing which simultaneously rotates two cylinders, one l of which carries the days and Athe other has mounted thereon the numerals l to 31.` y

One object of the present improvement is to mounta cylinder carrying numerals representing the daysof the month for simultaneous rotary and axial movement, the numeral dates thereon'being arranged about the' cylinder so that they are brought into view by a combination of the two movements. A similar cylinder carrying the days of the week ismounted for rotary movement only, and detent connections between the two cylinders are provided for etlecting simultaneous rotation of'both cylinders byturning one of them, the arrangement being suchthat in dependent rotation ofthe respective cylinders is obtained by holding one'of the cylk inders andl turning the other cylinder, for synchronizing the days of the week with the numerals representing the days of the month. This independent movement of the cylinders needs to be done only at the beginning of each month, after which both cylinders are rotated in unison by turning one knurled head. The preferred form of the improvement is shown in the accompanying drawings, in which Fig. 1 is a vertical longitudinal section of the calendar; Fig. 2 is a vertical transverse section; Fig. 3 is a plan view of the cylinders removed from the casing with one of the cylinders partially broken away and in section; Fig. 4 is a transverse vertical section of Fig. 3 through both cylinders at the notched end of the inner cylinder, and Fig. 5 is a front view ofthe calendar.

Referring to the drawings, it will be seen that the rotary calendar comprises a cylinder 3`upon the outer surface of which the days of the month are shown spirally, asindicated in Fig. 3. VThe cylinder 3 telescopes into another cylinder 4 upon the outer surface ofwhich the days ofthe week (two sets) are mounted, as indicated in Fig. 3, the days Vof the week and the numerals of the monthly dates being adapted to show through sight vopenings 5 inthe upper frontl portion of an f' enclosing cylindrical casing `10, the sight openings being arranged in position for "the best visibility. i l Y 'Y Knurledheads are provided at each end 'of the casingf10` for rotatingthecylinders 3 and 4, the knurled head 1 for rotating cylin`der'3 being providedwith axially extending rods 7.9, screw-threaded into 'the head1 and passing through holes in the disc end 3a or' the cylinder 3. This construction is adapted to permit axial or longitudinal movement ofthe cylinder 3 as itfis'rotated.'

In order to e'ect the axial'movement of the cylinder 3 simultaneously with rotary movementA thereof, the disc end 3a is provided with a threaded central opening cooperating with a screw'threaded rod 8, Vextending axially of both cylinders as shown in-Figs. l and 3. The threads on the screw S'are shown fourto the pitch, the "pitch beingequal to the` space between centers of .adj acent spirals of the numerals Vrepresenting monthly dates on the outer surface of the cylinder 3. This arrangementpermits the use of liner threads on the screw while providing for the desired axial movement of the cylinder.

In o rder to permit independent adjustment and for simultaneous rotation of cylinders 3 and 4 and for axial` movement oit' the monthly date cylinder 3, detent connecting means are provided between cylinders 3 and 4, properly spaced to align the days of the week with the` days ofthe month, so that they may be properly displayed at the sight openings 5. For this purpose the leitend of the cylinder 3 is. provided with an outwardly extending flange, in which a plurality of notches 6 are cut, there being fourteen shown in the drawings, because two sets of week days on the cylinder 4 requires fourteen spaces. For cooperation with the notches 6 in the flange of the cylinder 3, there is arranged a resilient detent member 7 extending longitudinally of and parallel with the axis vofthe cylinder 4, said detent member being formed by a In order to retain the rotating parts of the calendar in properrelatio'n, `the knurled;

ends 1 and 2 aremounted for rotation upon the respective ends of the screw 8 and the latter is secured by means of screws in the ends thereof between supporting plates 11, which are mounted upon theV base block 13 and are provided with downwardly projecting bolts, passing through the base block and secured'thereto by nuts 15, located in recesses onfthe undersidey of the base block, as will be seen in Figs. land 2. The casing cylinder 10 extends'between the rotary knurled ends 1 and 2, the latter being provided with flanges extending over reduced ends of the casing cylinder 10,` as will be seen in Fig.y 1, the casing cylinder being mounted on the base block 13 and held in proper position by downwardly projecting screw studs 14.

`For displaying the. month, a small casing Awith a rectangular window is mounted on the base of thecalendar and provided with cards or slips 16 having the months thereon, which may be changed each. month.

In operation, v the knurled end 1 .is rotated forward or`A by a left turn to withdraw theV cylinder 3 from cylinder 4 to bring the monthly date cylinder 3 back tol initial position so that the numeral 1 thereon will register with the small'window 5 in the casing 10 and then the cylinder 3 should be held 'or prevented from rotation by holding the knurled end 1 while the cylinder 4 is rotated by turning the knurled end 2, to kwhich the cylinder 4 is soldered or, otherwise secured. The detent connection (fi-J?) between the two cylinders permits thisindependent adjustment in order to synchronize the weekly and monthly dates, or to bring the day of the week on which the first of the monthy falls into register with the sight openings 5 when the numeral 1 of the cylinder 3 is in register with its sight opening 5. Thereafter, the detent connections 6 and 7 will cause both cylinders 3 and 4 to turn in unison to present the successive days of the week and days of the month in proper sequence by simply turning one of the knurled ends, preferably the knurled end at the right'hand end of the calendar. v

I claim 1. VA'rotary calendar Vcomprising a cylinlongitudinally extending pawl secured to and projecting from the said second cylinder into the path of saidA notched flange of the first cylinder for cooperation with said notches for aligning the days of the week with the days of the month and for temporarily locking both cylinders together for simultaneous rotation while permitting independent rotary adjustment between the cylinders by holding one cylinder and rotating the other in eithery direction, said aligning pawl being long enough axially to be e'ective in any position of axial movement of the. first cylinder relative to the second cylinder.

2. The rotary calendar as in claim 1, wherein said telescoping cylinders are mounted within and for rotation about the axis of a horizontally disposed vcylindrical 'casing having its ends closed by rotatable heads, one ofV said heads being provided with rods extending parallel with said axis into and adapted for rotating said first named cylinder, the rods permitting said axial movement of the cylinder and said axial movement is effected by a fixed screw threaded rod cooperating with a nut secured to said first named cylinder as'the latter is rotated by said rods, said second cylinder being secured to the otherfrotary'head for rotation in a fixedl position.

' 3. A vrotary calendar comprising a cylindrical casing provided with sight openings for the days of the week and the days of the month, a cylinder provided with a head forming one end of the casing and adapted for rotating said cylindervin fixed position, the days ofthe week beingv mounted on said cylinder for rotation into register with the. corresponding sight opening, a second rotary cylinder adapted to telescopingly slide into the first named cylinder and mounted for simultaneous/axial movement as it is rotated to bring the days of the month into register with said other sight opening, a rotatable head forming the other end of the casing and provided with means for rotating said second cylinder while permitting said axial movement, means for effecting said axial movement of said second cylinder, and resilientpawland notch connecting means between the two cylinders for effecting rotation in unison of both cylinders by'rotating one of them, said detent connecting means being adapted to permit simultaneous independent relative rotation of the cylinders in either direction for synchronizing'the Weekly and monthly dates at the beginning of the month, after which the cylinders are rotated in uni# son.

SADAYOSHI NAKAHARA. 

